CN203582492U - Yellow phosphorus purifying device - Google Patents

Yellow phosphorus purifying device Download PDF

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Publication number
CN203582492U
CN203582492U CN201320727123.6U CN201320727123U CN203582492U CN 203582492 U CN203582492 U CN 203582492U CN 201320727123 U CN201320727123 U CN 201320727123U CN 203582492 U CN203582492 U CN 203582492U
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yellow phosphorus
outlet
phosphorus
import
tank
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Expired - Lifetime
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CN201320727123.6U
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Chinese (zh)
Inventor
王平
时宏杰
杨光明
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Wengfu Group Co Ltd
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Wengfu Group Co Ltd
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Abstract

The utility model discloses a yellow phosphorus purifying device which comprises a crystallizer (7), an extraction tank (27), a zone melting device and a filter device, wherein a pipeline from a crystallizer yellow phosphorus outlet (6) to an extraction tank yellow phosphorus inlet (22) is provided with a yellow phosphorus pump; a pipeline from an extraction tank yellow phosphorus outlet (26) to a buffer tank yellow phosphorus inlet (33) is also provided with a yellow phosphorus conveying pump; a high-purity yellow phosphorus tank yellow phosphorus outlet (45) is connected with a phosphorus pressing tank yellow phosphorus inlet (8) through a pipeline; a phosphorus pressing tank yellow phosphorus outlet (10) is connected with a filter yellow phosphorus inlet (17) through a pipeline. The device disclosed by the utility model purifies yellow phosphorus by combining crystallization, extraction, zone melting and filtering processes, and can improve the purity of phosphorus while the effect is relatively good.

Description

Yellow phosphorus purification devices
Technical field
The utility model relates to a kind of yellow phosphorus purification devices, particularly a kind of high-purity yellow phosphorus production equipment.
Background technology
In industrial yellow phosphorus, beyond arsenic removal, also contain mechanical impurity, inorganic impurity and organic matter.These impurity mainly contain:
Metallic element: Ca, Fe, Al, Mg, Sr, Mn, Na, K, Ti, V, Cr, Ni, Ga, Cd, Cu, Sb, Pb, Zn, Sn, U.
Semimetallic elements: Se, Si, C, B, As, Bi.
Organism: phenol, anthracene, tar and polyatom polycyclic aromatic hydrocarbons, more than approximately 30 kinds.
Owing to containing above-mentioned impurity in industrial yellow phosphorus, have a strong impact on its range of application, and the purposes of high purity phosphorus Chemicals is very extensive, take high purity phosphorus as example, InP, GaP etc. is the important source material in electronic industry, is the doping agent of planar expitaxial transistor and unicircuit; At petrochemical field, highly purified PCl3, P2O5 are advanced lubrication oil additivess; In pharmaceutical industries, high purity phosphorus is the raw material of the medicines such as production immunosuppressor, vasodilator, nootropic agents; In addition, high purity phosphorus is also widely used in fields such as foodstuffs industry, automobile making, military project, aviations.
In yellow phosphorus, contain inorganic impurity, organic impurity and mechanical impurity, have a strong impact on range of application and the economic value added of yellow phosphorus, for this reason Research Centers more both domestic and external in one's power colleges and universities all research yellow phosphorus impurity removal methods.But because of the complicacy of yellow phosphorus impurity, make its chemical method of having reported and physical method remove arsenic in yellow phosphorus be all faced with that phosphorous recovery is low, refining effect is limited, etc. problem.
The impurity component of industrial yellow phosphorus is very complicated, adopt a kind of single method method, is difficult to reach effect desirable, economy, therefore must adopt multiple method of purification coupling.
Summary of the invention
the purpose of this utility model is: a kind of purification devices of yellow phosphorus is safely and efficiently provided.To adapt to the needs of large-scale production, reach production operation controllability strong, the object that yellow phosphorus purification efficiency is high.
The technical solution of the utility model: a kind of yellow phosphorus purification devices, comprises crystallizer, extraction tank, district's fusing device and filtration unit;
Described crystallizer top arranges respectively the import of crystallizer yellow phosphorus, the import of yellow phosphorus lysate, and the top, side of crystallizer is also provided with washings import, and the bottom of crystallizer is provided with the outlet of crystallizer yellow phosphorus; Described crystallizer outside is provided with thermal insulation layer, and the bottom of thermal insulation layer is provided with crystallizer cooling liquid inlet, at thermal insulation layer, upper lateral part is provided with to crystallizer cooling liquid outlet;
Described extraction tank top arranges respectively the import of extraction tank yellow phosphorus, extraction agent import, and the top, side of extraction tank is also provided with extraction liquid overflow port, and the bottom of extraction tank is provided with the outlet of extraction tank yellow phosphorus;
Described district fusing device comprises dashpot, zone melting equipment, high-purity yellow phosphorus groove and low-arsenic yellow phosphorus groove; Described dashpot top is provided with the import of dashpot yellow phosphorus and dashpot sealing water inlet; The outlet of dashpot yellow phosphorus is located at the bottom of dashpot; Described zone melting equipment comprises molten bath, district, ring heater, annular water cooler, drive unit, molten bath, district is arranged on bearing, ring heater and annular water cooler are installed around molten bath, district, ring heater and annular water cooler form by some groups respectively, along molten bath, district axially alternately, drive unit is connected with annular water cooler with ring heater by transom; Described high-purity yellow phosphorus groove top is provided with high-purity yellow phosphorus groove sealing water inlet and the import of high-purity yellow phosphorus groove yellow phosphorus; Bottom is provided with the outlet of high-purity yellow phosphorus groove yellow phosphorus; Described low-arsenic yellow phosphorus groove top is provided with low-arsenic yellow phosphorus groove sealing water inlet and the import of low-arsenic yellow phosphorus groove yellow phosphorus; Bottom is provided with the outlet of low-arsenic yellow phosphorus groove yellow phosphorus; Described dashpot yellow phosphorus outlet is connected to the zone melting equipment yellow phosphorus import at zone melting equipment top, the zone melting equipment high-purity yellow phosphorus outlet of zone melting device bottom is connected to the import of high-purity yellow phosphorus groove yellow phosphorus, and the zone melting equipment low-arsenic yellow phosphorus outlet of zone melting device bottom is connected to the import of low-arsenic yellow phosphorus groove yellow phosphorus;
Described filtration unit comprises strainer and presses phosphorus tank; The top of described pressure phosphorus tank is respectively equipped with presses the yellow phosphorus import of phosphorus tank and presses the outlet of phosphorus tank yellow phosphorus, presses the top, side of phosphorus tank to be provided with phosphorous liquid flooding mouth; Described filter top is respectively equipped with the import of strainer yellow phosphorus and washings import, and the bottom of described strainer is provided with yellow phosphorus outlet, and the bottom of described strainer is provided with sludge outlet;
The pipeline that described crystallizer yellow phosphorus exports to the import of extraction tank yellow phosphorus is provided with yellow phosphorus pump, and described extraction tank yellow phosphorus exports on the pipeline of dashpot yellow phosphorus import and is also provided with yellow phosphorus transferpump; Described high-purity yellow phosphorus groove yellow phosphorus outlet is connected to and is pressed the import of phosphorus tank yellow phosphorus by pipeline; Described pressure phosphorus tank yellow phosphorus outlet is connected to the import of strainer yellow phosphorus by pipeline.
Described extraction tank outside is provided with thermal insulation layer, and the bottom of thermal insulation layer is provided with the import of extraction tank insulation liquid, at thermal insulation layer, upper lateral part is provided with to the outlet of extraction tank insulation liquid.
The cylindrical shell that the molten bath, district of described zone melting equipment is closed at both ends; The quantity of described ring heater is identical with the quantity of annular water cooler.
The molten bath, district of described zone melting equipment and horizontal angle are 10-15 degree.
The hot water inlet of the ring heater in described zone melting equipment is above molten bath, district, and hot water outlet is below the opposite side of molten bath, district; The cooling water inlet of annular water cooler is above molten bath, district, and cooling water outlet is below the opposite side of molten bath, district.
The outside of described pressure phosphorus tank is provided with thermal insulation layer, and the bottom of thermal insulation layer is provided with presses the import of phosphorus tank insulation liquid, is provided with presses the outlet of phosphorus tank insulation liquid on the top of thermal insulation layer.
The outside of described strainer is provided with thermal insulation layer, and the bottom of thermal insulation layer is provided with the import of strainer insulation liquid, at thermal insulation layer, upper lateral part is provided with to the outlet of strainer insulation liquid.
The filtering micropore size of the filter core of above-mentioned strainer is at 2~5um.
During the utility model work, from the import of yellow phosphorus lysate to crystallizer, add yellow phosphorus lysate (as dithiocarbonic anhydride etc.), industrial yellow phosphorus enters crystallizer from the outlet of rinse bath yellow phosphorus, regulate the flow control Tc of the crystallizer cooling fluid of thermal insulation layer, yellow phosphorus crystallization post crystallization mother liquor enters lysate production system again, again from washings import to crystallizer tank, add crystal washings, after washing is good, washings enters washings regeneration system rapidly, yellow phosphorus enters extraction tank from the import of extraction tank yellow phosphorus, add extraction agent to extract yellow phosphorus, yellow phosphorus after extraction pumps into dashpot buffering, then by the import of zone melting equipment yellow phosphorus, enter molten bath, district, keep ring heater and annular water cooler in conducting state, open drive unit, yellow phosphorus subregion melts the two ends of transferring to gradually molten bath, district, by the outlet of zone melting equipment high-purity yellow phosphorus and the outlet of zone melting equipment low-arsenic yellow phosphorus, enter respectively high-purity yellow phosphorus groove and low-arsenic yellow phosphorus groove, the yellow phosphorus out being obtained by high-purity yellow phosphorus groove is pressed phosphorus tank from pressing the import of phosphorus tank yellow phosphorus to enter, after pressing phosphorus tank to enter yellow phosphorus, by adjusting, press the adjustment of phosphorus tank chuck hot water flow to press temperature of charge in phosphorus tank, make yellow phosphorus in liquid state, press the yellow phosphorus in phosphorus tank through pipeline, from the import of strainer yellow phosphorus, to enter strainer by pressing phosphorus tank yellow phosphorus to export, yellow phosphorus after filtration enters the finished product stocking system from strainer yellow phosphorus outlet, and filter residue enters yellow phosphorus acid making system and fully utilizes from entering sludge outlet.By low-arsenic yellow phosphorus groove yellow phosphorus out, enter phosphoric acid system and prepare PHOSPHORIC ACID TECH.GRADE.
Advantage of the present utility model: comprehensively adopted crystallization, extraction, district's method molten, that filter to carry out purifying to yellow phosphorus, can improve the purity of phosphorus, and the connecting of whole device unit is good, production operation serialization, be difficult for leaking, can be to environment; And equipment of the present utility model has adopted the thermal insulation layer of jacketed type, can be good at controlling temperature, reduced the waste of the energy, than existing external heat power supply device, not only reduce equipment cost, reduced the energy waste in hot transmission, and can not produce waste gas waste residue, saving equipment takes up an area, and does not affect yellow phosphorus quality.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model;
1-crystallizer cooling fluid entrance; The import of 2-crystallizer yellow phosphorus; The import of 3-yellow phosphorus lysate; The import of 4-washings; 5-crystallizer cooling liquid outlet; The outlet of 6-crystallizer yellow phosphorus; 7-crystallizer; 8-presses the import of phosphorus tank yellow phosphorus; 9-presses the outlet of phosphorus tank insulation liquid; 10-presses the outlet of phosphorus tank yellow phosphorus; The phosphorous hydrorrhea head piece of 11-; 12-presses phosphorus tank; 13-presses the import of phosphorus tank insulation liquid; The import of 14-washings; 15-strainer; The import of 16-strainer insulation liquid; The import of 17-strainer yellow phosphorus; The outlet of 18-strainer insulation liquid; The outlet of 19-strainer yellow phosphorus; 20-sludge outlet; The import of 21-extraction tank insulation liquid; The import of 22-extraction tank yellow phosphorus; The import of 23-extraction agent; 24-extraction liquid overflow port; The outlet of 25-extraction tank insulation liquid; The outlet of 26-extraction tank yellow phosphorus; 27-extraction tank; 28-dashpot sealing water inlet; 29-dashpot sealing water overflow port; 30-dashpot insulation water out; 31-dashpot insulation water inlet; The outlet of 32-dashpot yellow phosphorus; The import of 33-dashpot yellow phosphorus; The outlet of 34-zone melting equipment high-purity yellow phosphorus; The outlet of 35-zone melting equipment low-arsenic yellow phosphorus; 36-hot water inlet; 37-hot water outlet; 38-cooling water outlet; 39-cooling water inlet; The import of 40-high-purity yellow phosphorus groove yellow phosphorus; 41-high-purity yellow phosphorus groove sealing water inlet; 42-high-purity yellow phosphorus groove insulation water inlet; 43-high-purity yellow phosphorus groove sealing water overflow port; 44-high-purity yellow phosphorus groove insulation water out; The outlet of 45-high-purity yellow phosphorus groove yellow phosphorus; The import of 46-low-arsenic yellow phosphorus groove yellow phosphorus; 47-low-arsenic yellow phosphorus groove sealing water inlet; 48-low-arsenic yellow phosphorus groove sealing water overflow port; 49-low-arsenic yellow phosphorus groove insulation water out; 50-low-arsenic yellow phosphorus groove insulation water inlet; The outlet of 51-low-arsenic yellow phosphorus groove yellow phosphorus; 52-bearing; Molten bath, 53-district; The import of 54-zone melting equipment yellow phosphorus.
Embodiment
embodiment
A yellow phosphorus purification devices, comprises crystallizer 7, extraction tank 27, district's fusing device and filtration unit;
Described crystallizer 7 tops arrange respectively crystallizer yellow phosphorus import 2, yellow phosphorus lysate import 3, and the top, side of crystallizer 7 is also provided with washings import 4, and the bottom of crystallizer 7 is provided with crystallizer yellow phosphorus outlet 6; Described crystallizer 7 outsides are provided with thermal insulation layer, and the bottom of thermal insulation layer is provided with crystallizer cooling liquid inlet 1, at thermal insulation layer, upper lateral part are provided with to crystallizer cooling liquid outlet 5;
Described extraction tank 27 tops arrange respectively extraction tank yellow phosphorus import 22, extraction agent import 23, and the top, side of extraction tank 27 is also provided with extraction liquid overflow port 24, and the bottom of extraction tank 27 is provided with extraction tank yellow phosphorus outlet 26; Described extraction tank 27 outsides are provided with thermal insulation layer, and the bottom of thermal insulation layer is provided with extraction tank insulation liquid import 21, at thermal insulation layer, upper lateral part are provided with to extraction tank insulation liquid outlet 24;
Described district fusing device comprises dashpot, zone melting equipment, high-purity yellow phosphorus groove and low-arsenic yellow phosphorus groove; Described dashpot top is provided with the import 33 of dashpot yellow phosphorus and dashpot sealing water inlet 28; Dashpot yellow phosphorus outlet 32 is located at the bottom of dashpot; Described zone melting equipment comprises molten bath, district 53, ring heater, annular water cooler, drive unit, molten bath, district 53 is arranged on bearing 52, ring heater and annular water cooler are installed around molten bath, district 53, ring heater and annular water cooler form by some groups respectively, along molten bath, district axially alternately, drive unit is connected with annular water cooler with ring heater by transom; Described high-purity yellow phosphorus groove top is provided with high-purity yellow phosphorus groove sealing water inlet 41 and high-purity yellow phosphorus groove yellow phosphorus import 40; Bottom is provided with high-purity yellow phosphorus groove yellow phosphorus outlet 45; Described low-arsenic yellow phosphorus groove top is provided with low-arsenic yellow phosphorus groove sealing water inlet 47 and low-arsenic yellow phosphorus groove yellow phosphorus import 46; Bottom is provided with low-arsenic yellow phosphorus groove yellow phosphorus outlet 51; Described dashpot yellow phosphorus outlet 32 is connected to the zone melting equipment yellow phosphorus import 54 at zone melting equipment top, the zone melting equipment high-purity yellow phosphorus outlet 34 of zone melting device bottom is connected to high-purity yellow phosphorus groove yellow phosphorus import 40, and the zone melting equipment low-arsenic yellow phosphorus outlet 35 of zone melting device bottom is connected to low-arsenic yellow phosphorus groove yellow phosphorus import 46;
Described filtration unit comprises strainer 15 and presses phosphorus tank 12; The top of described pressure phosphorus tank 12 is respectively equipped with presses phosphorus tank yellow phosphorus import 8 and presses phosphorus tank yellow phosphorus outlet 10, press the top, side of phosphorus tank 8 to be provided with phosphorous liquid flooding mouth 11, the outside of described pressure phosphorus tank 12 is provided with thermal insulation layer, the bottom of thermal insulation layer is provided with presses phosphorus tank insulation liquid import 13, is provided with presses phosphorus tank insulation liquid outlet 9 on the top of thermal insulation layer; Described strainer 15 tops are respectively equipped with strainer yellow phosphorus import 17 and washings import 14, and the bottom of described strainer 15 is provided with strainer yellow phosphorus outlet 19, and the bottom of described strainer 15 is provided with sludge outlet 20; The outside of described strainer 15 is provided with thermal insulation layer, and the bottom of thermal insulation layer is provided with strainer insulation liquid import 16, at thermal insulation layer, upper lateral part is provided with to strainer insulation liquid outlet 18;
Described crystallizer yellow phosphorus outlet 6 pipelines to extraction tank yellow phosphorus import 22 are provided with yellow phosphorus pump, and described extraction tank yellow phosphorus outlet 26 is also provided with yellow phosphorus transferpump to the pipeline of dashpot yellow phosphorus import 33; Described high-purity yellow phosphorus groove yellow phosphorus outlet 45 is connected to and is pressed phosphorus tank yellow phosphorus import 8 by pipeline; Described pressure phosphorus tank yellow phosphorus outlet 10 is connected to strainer yellow phosphorus import 17 by pipeline;
The cylindrical shell that the molten bath, district 53 of described zone melting equipment is closed at both ends; The quantity of described ring heater is identical with the quantity of annular water cooler.
Molten bath, district 53 and the horizontal angle of described zone melting equipment are 10-15 degree.
The top in the molten bath, hot water inlet 36 district 53 of the ring heater in described zone melting equipment, the below of molten bath, hot water outlet 37 district 53 opposite sides; The top in the molten bath, cooling water inlet 39 district 53 of annular water cooler, the below of molten bath, cooling water outlet 38 district 53 opposite sides.
The filtering micropore size of the filter core of above-mentioned strainer is at 2~5um.

Claims (8)

1. a yellow phosphorus purification devices, is characterized in that: comprise crystallizer (7), extraction tank (27), district's fusing device and filtration unit;
Described crystallizer (7) top arranges respectively crystallizer yellow phosphorus import (2), yellow phosphorus lysate import (3), and the top, side of crystallizer (7) is also provided with washings import (4), and the bottom of crystallizer (7) is provided with crystallizer yellow phosphorus outlet (6); Described crystallizer (7) outside is provided with thermal insulation layer, and the bottom of thermal insulation layer is provided with crystallizer cooling liquid inlet (1), at thermal insulation layer, upper lateral part is provided with to crystallizer cooling liquid outlet (5);
Described extraction tank (27) top arranges respectively extraction tank yellow phosphorus import (22), extraction agent import (23), and the top, side of extraction tank (27) is also provided with extraction liquid overflow port (24), and the bottom of extraction tank (27) is provided with extraction tank yellow phosphorus outlet (26);
Described district fusing device comprises dashpot, zone melting equipment, high-purity yellow phosphorus groove and low-arsenic yellow phosphorus groove; Described dashpot top is provided with dashpot yellow phosphorus import (33) and dashpot sealing water inlet (28); Dashpot yellow phosphorus outlet (32) is located at the bottom of dashpot; Described zone melting equipment comprises molten bath, district (53), ring heater, annular water cooler, drive unit, molten bath, district (53) is arranged on bearing (52), ring heater and annular water cooler are installed around molten bath, district (53), ring heater and annular water cooler form by some groups respectively, along molten bath, district axially alternately, drive unit is connected with annular water cooler with ring heater by transom; Described high-purity yellow phosphorus groove top is provided with high-purity yellow phosphorus groove sealing water inlet (41) and high-purity yellow phosphorus groove yellow phosphorus import (40); Bottom is provided with high-purity yellow phosphorus groove yellow phosphorus outlet (45); Described low-arsenic yellow phosphorus groove top is provided with low-arsenic yellow phosphorus groove sealing water inlet (47) and low-arsenic yellow phosphorus groove yellow phosphorus import (46); Bottom is provided with low-arsenic yellow phosphorus groove yellow phosphorus outlet (51); Described dashpot yellow phosphorus outlet (32) is connected to the zone melting equipment yellow phosphorus import (54) at zone melting equipment top, the zone melting equipment high-purity yellow phosphorus outlet (34) of zone melting device bottom is connected to high-purity yellow phosphorus groove yellow phosphorus import (40), and the zone melting equipment low-arsenic yellow phosphorus outlet (35) of zone melting device bottom is connected to low-arsenic yellow phosphorus groove yellow phosphorus import (46);
Described filtration unit comprises strainer (15) and presses phosphorus tank (12); The top of described pressure phosphorus tank (12) is respectively equipped with presses phosphorus tank yellow phosphorus import (8) and presses phosphorus tank yellow phosphorus outlet (10), presses the top, side of phosphorus tank (8) to be provided with phosphorous liquid flooding mouth (11); Described strainer (15) top is respectively equipped with strainer yellow phosphorus import (17) and washings import (14), and the bottom of described strainer (15) is provided with strainer yellow phosphorus outlet (19); The bottom of described strainer (15) is provided with sludge outlet (20);
Described crystallizer yellow phosphorus outlet (6) is provided with yellow phosphorus pump to the pipeline of extraction tank yellow phosphorus import (22), and described extraction tank yellow phosphorus outlet (26) is also provided with yellow phosphorus transferpump to the pipeline of dashpot yellow phosphorus import (33); Described high-purity yellow phosphorus groove yellow phosphorus outlet (45) is connected to and is pressed phosphorus tank yellow phosphorus import (8) by pipeline; Described pressure phosphorus tank yellow phosphorus outlet (10) is connected to strainer yellow phosphorus import (17) by pipeline.
2. device as claimed in claim 1, is characterized in that described extraction tank (27) outside is provided with thermal insulation layer, and the bottom of thermal insulation layer is provided with extraction tank insulation liquid import (21), at thermal insulation layer, upper lateral part is provided with to extraction tank insulation liquid outlet (24).
3. device as claimed in claim 1, the molten bath, district (53) that it is characterized in that described zone melting equipment is the cylindrical shell of closed at both ends; The quantity of described ring heater is identical with the quantity of annular water cooler.
4. device as claimed in claim 1, is characterized in that the molten bath, district (53) of described zone melting equipment and horizontal angle are 10-15 degree.
5. device as claimed in claim 1, is characterized in that the hot water inlet (36) of the ring heater in described zone melting equipment is in the top of molten bath, district (53), and hot water outlet (37) is in the below of molten bath, district (53) opposite side; The cooling water inlet (39) of annular water cooler is in the top of molten bath, district (53), and cooling water outlet (38) is in the below of molten bath, district (53) opposite side.
6. device as claimed in claim 1, is characterized in that the outside of described pressure phosphorus tank (12) is provided with thermal insulation layer, and the bottom of thermal insulation layer is provided with presses phosphorus tank insulation liquid import (13), is provided with presses phosphorus tank insulation liquid outlet (9) on the top of thermal insulation layer.
7. device as claimed in claim 1, is characterized in that the bottom of described strainer (15) is provided with sludge outlet (20); The outside of described strainer (15) is provided with thermal insulation layer, and the bottom of thermal insulation layer is provided with strainer insulation liquid import (16), at thermal insulation layer, upper lateral part is provided with to strainer insulation liquid outlet (18).
8. device as claimed in claim 1, is characterized in that the filtering micropore size of filter core of described strainer (15) is at 2~5um.
CN201320727123.6U 2013-11-18 2013-11-18 Yellow phosphorus purifying device Expired - Lifetime CN203582492U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201320727123.6U CN203582492U (en) 2013-11-18 2013-11-18 Yellow phosphorus purifying device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201320727123.6U CN203582492U (en) 2013-11-18 2013-11-18 Yellow phosphorus purifying device

Publications (1)

Publication Number Publication Date
CN203582492U true CN203582492U (en) 2014-05-07

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ID=50580442

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Application Number Title Priority Date Filing Date
CN201320727123.6U Expired - Lifetime CN203582492U (en) 2013-11-18 2013-11-18 Yellow phosphorus purifying device

Country Status (1)

Country Link
CN (1) CN203582492U (en)

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Granted publication date: 20140507

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